This is interesting but doesn't seem right. In the second sentence of your explanation, if there's a runner on 1b and the first baseman fields a ball and steps on the bag (first base) before the batter-runner gets there, that removes the force at 2nd and THAT is why the runner heading to 2nd has to be tagged. But you're saying if the first baseman for example accidentally misses the bag entirely when trying to step on it that the force at 2nd is still removed because he gave it the ol' college try? With Clemons safe at 1b, Bell cannot also occupy 1b and so to me is still forced to 2nd.